[Java 1.5; Eclipse Galileo]
当调用getInputStream()方法时,HttpsURLConnection似乎停止。我尝试过使用不同的网站无效(目前https://www.google.com)。我应该指出我正在使用http S 。
以下代码已根据我从其他StackOverflow答案中学到的内容进行了修改。但是,到目前为止我没有尝试过任何解决方案。
我非常感谢能够朝着正确的方向努力:)
public static void request( URL url, String query )
{
try{
HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
//connection.setReadTimeout( 5000 ); //<-- uncommenting this line at least allows a timeout error to be thrown
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
System.setProperty("http.keepAlive", "false");
connection.setRequestMethod( "POST" );
// setting headers
connection.setRequestProperty("Content-length",String.valueOf (query.length()));
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); //WAS application/x-www- form-urlencoded
connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows 98; DigExt)");
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
System.out.println( "THIS line stalls" + connection.getInputStream() );
////////////////////////////////////////////////////////////////////////////////////
}catch( Exception e ) {
System.out.println( e );
e.printStackTrace();
}
典型错误如下:
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.sun.net.ssl.internal.ssl.InputRecord.readFully(InputRecord.java:293)
at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:331)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:782)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:739)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:75)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
at java.io.BufferedInputStream.read(BufferedInputStream.java:313)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:681)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:626)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:983)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:234)
at https_understanding.HTTPSRequest.request(HTTPSRequest.java:60)
at https_understanding.Main.main(Main.java:17)
答案 0 :(得分:5)
connection.setDoOutput(true);
这意味着在尝试从输入流中读取之前,必须打开,写入和关闭连接的输出流。请参阅the docs。
答案 1 :(得分:3)
我在Android 2.2中重现了这个问题:当通过无线和HTTPS URL从Web服务器下载时,错误是URLConnection.getInputStream()
中的套接字“读取超时”要修复它,请对InputStream使用url.openStream()而不是connection.getInputStream()
奖金:您可以获取正在下载的文件的长度,以便显示%完整指标
代码示例:
private final int TIMEOUT_CONNECTION = 5000;//5sec
private final int TIMEOUT_SOCKET = 30000;//30sec
file = new File(strFullPath);
URL url = new URL(strURL);
URLConnection ucon = url.openConnection();
//this timeout affects how long it takes for the app to realize there's a connection problem
ucon.setReadTimeout(TIMEOUT_CONNECTION);
ucon.setConnectTimeout(TIMEOUT_SOCKET);
//IMPORTANT UPDATE:
// ucon.getInputStream() often times-out over wireless
// so, replace it with ucon.connect() and url.openStream()
ucon.connect();
iFileLength = ucon.getContentLength();//returns -1 if not set in response header
if (iFileLength != -1)
{
Log.i(TAG, "Expected Filelength = "+String.valueOf(iFileLength)+" bytes");
}
//Define InputStreams to read from the URLConnection.
// uses 5KB download buffer
InputStream is = url.openStream();//ucon.getInputStream();
BufferedInputStream inStream = new BufferedInputStream(is, 1024 * 5);
outStream = new FileOutputStream(file);
bFileOpen = true;
byte[] buff = new byte[5 * 1024];
//Read bytes (and store them) until there is nothing more to read(-1)
int total=0;
int len;
int percentdone;
int percentdonelast=0;
while ((len = inStream.read(buff)) != -1)
{
//write to file
outStream.write(buff,0,len);
//calculate percent done
if (iFileLength != -1)
{
total+=len;
percentdone=(int)(total*100/iFileLength);
//limit the number of messages to no more than one message every 10%
if ( (percentdone - percentdonelast) > 10)
{
percentdonelast = percentdone;
Log.i(TAG,String.valueOf(percentdone)+"%");
}
}
}
//clean up
outStream.flush();//THIS IS VERY IMPORTANT !
outStream.close();
bFileOpen = false;
inStream.close();
答案 2 :(得分:2)
也不要设置内容长度标题。 Java会为你做到这一点。